去看猴子挠痒痒。

See all the monkeys scratch, scratch, scratching.

一步两步走来，给你挠挠痒痒。

One step, two step, Tickle you under there.

好啦，可能其实这更像是在挠痒痒，但还是很酷对不对。

Okay, so maybe it's more of a tickle, but still...

科学家通过“挠痒痒”这种方式来使不同种类的大猩猩和一些人类婴儿发出笑声。

That's how researchers made a variety of apes and some human babies laugh.

这是一个失败的发明，因为人们还没靠近挠痒痒的机器，就已经被它的模样逗笑。

This was a failure because people could not go near the tickle machine without convulsing in laughter.